When you consider “the whole armor of God” with which the Christian is to arm himself, the first piece identified by Paul in Ephesians 6:14 is “the belt of truth” (ESV). The NKJV says, “Stand therefore, having girded your waist with truth.” The NASB says, “…having belted your waist with truth.” The soldier’s belt truly held everything together. Without it, he could not engage.
As Christians, we are to “fasten,” “gird” or “belt” our waist with “truth.” Without God’s truth, we are not equipped for spiritual conflict. God’s truth purifies (1 Pet. 1:22), sanctifies (John 17:17), makes us free (John 8:32) and keeps us anchored in the doctrine of Christ (Eph. 4:14-15), keeping our minds on target (1 Pet. 1:13) and keeping us from being entangled with the affairs of this world (2 Tim. 2:3-4).
How do we gird ourselves with truth? Study it (2 Tim. 2:15). Love it (2 Thess. 2:10). Know it (John 8:32). Walk in it (3 John 3-4). Obey it (1 Pet. 1:22). Do not stray from it (Jas. 5:19). So, do you have your belt of truth on? Is it bound tight?